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is a significant concern for physicians. Central
( C' A l; K# M- jprecocious puberty (CPP), which is mediated: n5 W, G: }/ P
through the hypothalamic pituitary gonadal axis, has
* I/ f8 J; ]: J- C0 |9 `8 K! Va higher incidence of organic central nervous system
2 U5 a1 r7 N" `0 g! ^! _lesions in boys.1,2 Virilization in boys, as manifested: R1 B6 q, c2 m7 x7 O
by enlargement of the penis, development of pubic
8 J0 }# D" o# z8 P/ M- M4 H8 O( ghair, and facial acne without enlargement of testi-
' t) l! M5 f5 f. z0 l3 Wcles, suggests peripheral or pseudopuberty.1-3 We
- V$ ]9 X7 ?- r. Treport a 16-month-old boy who presented with the
( {! b8 x' W1 menlargement of the phallus and pubic hair develop-& \' z! p3 u% ?5 t3 i' P8 z- Y
ment without testicular enlargement, which was due, d5 D/ J( ~* _2 o+ S. o p
to the unintentional exposure to androgen gel used by9 G( \9 p( g6 s
the father. The family initially concealed this infor-8 v1 J3 h/ V% p7 P$ P
mation, resulting in an extensive work-up for this
/ f7 u3 R$ v' \child. Given the widespread and easy availability of
) r0 I2 B/ M2 z4 Mtestosterone gel and cream, we believe this is proba-" [2 N3 s9 h+ K
bly more common than the rare case report in the
2 P6 f! {. [9 s) j' u7 iliterature.4
J9 V) {/ l0 R0 PPatient Report
. y& h2 Y" T* k# Q1 U& L' dA 16-month-old white child was referred to the
4 U0 b9 x6 J' |, B5 |8 Hendocrine clinic by his pediatrician with the concern
) v/ d2 }# k" p' |. l8 U/ } ?; Z e Cof early sexual development. His mother noticed
9 t* _8 C, p* i& V2 e9 ulight colored pubic hair development when he was. J) P5 S) d( R+ R. R* r# ~) Z
From the 1Division of Pediatric Endocrinology, 2University of
* Z0 G# |% I* XSouth Alabama Medical Center, Mobile, Alabama.7 d& l v4 O* s* x
Address correspondence to: Samar K. Bhowmick, MD, FACE,) W+ W8 v; m1 }( x% C
Professor of Pediatrics, University of South Alabama, College of
8 a) \, h; s# d TMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;7 S& f! }2 ^& E9 O
e-mail: [email protected].4 v1 ` Y( Q( x6 ]' N$ _3 ]7 l3 ^
about 6 to 7 months old, which progressively became
1 J) _1 N o: }/ V. cdarker. She was also concerned about the enlarge-) V/ X: ] i% l H1 n& y
ment of his penis and frequent erections. The child# y1 c: `8 t, C9 U; Y j+ [1 ~4 [. P
was the product of a full-term normal delivery, with
7 H& ~3 ^) d4 ta birth weight of 7 lb 14 oz, and birth length of
8 K. x7 \* h. @" g, W+ F5 [, {4 S3 _20 inches. He was breast-fed throughout the first year( F" r( x9 S* m% p, \! [
of life and was still receiving breast milk along with: F" f; w% k; @ R' G3 I$ H
solid food. He had no hospitalizations or surgery,
) c; C8 e6 E: Q2 [. Wand his psychosocial and psychomotor development
6 R1 D* t! d' i; e0 p9 Swas age appropriate.
@; I" c" i5 Y2 N- F( F) W8 ZThe family history was remarkable for the father,
* a5 ]3 o3 Q; x) O) ewho was diagnosed with hypothyroidism at age 16,
- c% P/ I6 Y# v- ^" ]which was treated with thyroxine. The father’s! [7 G: e# C& _9 T/ i0 ^
height was 6 feet, and he went through a somewhat$ h5 X* O$ x3 ~& w
early puberty and had stopped growing by age 14.
. H. @! z/ k9 Q8 l5 JThe father denied taking any other medication. The
/ B9 V, m% f/ G% ]5 Mchild’s mother was in good health. Her menarche
1 u+ I9 z0 J" ]1 nwas at 11 years of age, and her height was at 5 feet0 z+ J! k8 C+ Y6 [1 c
5 inches. There was no other family history of pre-
) O$ D5 |; B/ [; b% C% A; Acocious sexual development in the first-degree rela-( A# [+ l! n1 n3 M* n
tives. There were no siblings.& f! g5 m7 Q2 l& ^
Physical Examination
% ?; C# Y+ A' |+ aThe physical examination revealed a very active,
9 e4 R8 Y: {. `) |$ Bplayful, and healthy boy. The vital signs documented
* B( ?6 n1 z3 p: } r7 Oa blood pressure of 85/50 mm Hg, his length was% _7 X' f4 }% {5 B9 o
90 cm (>97th percentile), and his weight was 14.4 kg
9 m4 {6 h; M2 R6 c(also >97th percentile). The observed yearly growth
: C# S, F3 F) O4 E) @9 wvelocity was 30 cm (12 inches). The examination of
7 o" @3 [; U0 }' f# Zthe neck revealed no thyroid enlargement.# K1 [6 E1 h) L; ^" S
The genitourinary examination was remarkable for6 |3 V/ j: Y9 r
enlargement of the penis, with a stretched length of
% E" ]; y( P4 I ]2 K8 cm and a width of 2 cm. The glans penis was very well
) K0 ~. S2 d# c; G7 O) r( [3 e4 ^( Qdeveloped. The pubic hair was Tanner II, mostly around
* c5 J( ]' G. X) e$ [540
2 T) W' B6 D/ W1 o8 Zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 Y( m8 ~* X- a) c* jthe base of the phallus and was dark and curled. The
% e: ?# v6 X& Q% C/ \7 etesticular volume was prepubertal at 2 mL each.
* x' K0 Y0 ~1 W$ x7 F" V: m6 aThe skin was moist and smooth and somewhat
7 c- r9 ^" J* z: _( d h9 D& Doily. No axillary hair was noted. There were no9 b* d. |/ P* b; N4 {4 E
abnormal skin pigmentations or café-au-lait spots.
8 S4 B: v" q: l) @4 xNeurologic evaluation showed deep tendon reflex 2+
- P& [, F( Y5 R' t5 D6 y( |1 Sbilateral and symmetrical. There was no suggestion1 E' x9 h: R& V
of papilledema.. Z% h. N. \1 O& \" A! j Y6 d% H
Laboratory Evaluation
8 M, d9 A; N# D: w; f" r6 w: }The bone age was consistent with 28 months by
5 U; F* w$ h1 A) A- `# j$ C: J; s- k! xusing the standard of Greulich and Pyle at a chrono-& ]' V' ~/ S; G
logic age of 16 months (advanced).5 Chromosomal
& R2 R. f; {2 f& v, [karyotype was 46XY. The thyroid function test
$ @$ p6 I, Y$ ashowed a free T4 of 1.69 ng/dL, and thyroid stimu-' h) i! c" O; z6 F+ A- {
lating hormone level was 1.3 µIU/mL (both normal).
# R* k8 Q0 a! K1 x Y) F7 TThe concentrations of serum electrolytes, blood
* f* g" j1 V( L0 Jurea nitrogen, creatinine, and calcium all were) j, Y+ O. i0 F: k7 s) C
within normal range for his age. The concentration
! ^- l6 Z% X0 ^# Iof serum 17-hydroxyprogesterone was 16 ng/dL
, W8 G2 k* k9 z4 q5 b9 C! ~8 J(normal, 3 to 90 ng/dL), androstenedione was 20
! R3 O) R" r/ G* d7 yng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-1 o/ r/ p, O4 r7 Y
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
" n$ q3 |, p/ \' E) a5 Y r Xdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
$ P" h0 I3 g+ O" R% _49ng/dL), 11-desoxycortisol (specific compound S)
- I! I4 |0 t* ] cwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-0 ~0 p$ a8 m/ Q- @" d" V% t; [ Q
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total" h. f; u( l6 U% Z8 j
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 a# [! ^/ j2 n$ [# y7 \
and β-human chorionic gonadotropin was less than
: o* A9 a6 ]: c U5 mIU/mL (normal <5 mIU/mL). Serum follicular
U; c& Y7 m7 v5 H+ Tstimulating hormone and leuteinizing hormone
; G3 f5 S' m+ U% I& |3 h/ Tconcentrations were less than 0.05 mIU/mL
% d, P+ F% d- [# ?7 ?9 f8 Z0 O(prepubertal).
2 o+ a. F9 t4 e) @The parents were notified about the laboratory1 P e9 S' X0 Y( r& o
results and were informed that all of the tests were& T1 w, f; Y V6 X) Z" i; s
normal except the testosterone level was high. The* R) X8 ~; o$ n V
follow-up visit was arranged within a few weeks to, f; c+ d5 ~1 B; J; |# z% D0 g
obtain testicular and abdominal sonograms; how-
) @5 I4 f8 |: g4 J, K4 ~# Z* Oever, the family did not return for 4 months.
& [' m f" R& j8 I; |; oPhysical examination at this time revealed that the- p# U2 A, f) [8 L7 w1 r& y9 v
child had grown 2.5 cm in 4 months and had gained
1 u& C# s* E# Z/ |8 d, f1 H) B' f2 kg of weight. Physical examination remained. T1 T0 X3 g. ]4 {
unchanged. Surprisingly, the pubic hair almost com-
% E5 U& C7 \, }4 I! v. E+ Apletely disappeared except for a few vellous hairs at6 z6 o' E7 l1 w: [ M$ a
the base of the phallus. Testicular volume was still 2) x" M# T6 i3 O, P1 c2 K
mL, and the size of the penis remained unchanged.7 h5 Y4 T: |, P' ]
The mother also said that the boy was no longer hav-* f6 H) s4 R6 m% y3 w& P9 u9 s
ing frequent erections.# \4 m4 L1 b% z
Both parents were again questioned about use of. q! P. s+ @+ F5 q7 }
any ointment/creams that they may have applied to% o m6 H# B" i. i) w* J1 q
the child’s skin. This time the father admitted the$ Z7 E7 y& z- W: B8 P
Topical Testosterone Exposure / Bhowmick et al 541
: {% L( ^; C% d" ]use of testosterone gel twice daily that he was apply-
0 R' e( ~+ j1 Z/ Z0 ~ing over his own shoulders, chest, and back area for9 h2 S! r0 y7 ]
a year. The father also revealed he was embarrassed
! |, E" D6 u" C: W' }0 Ito disclose that he was using a testosterone gel pre-
! u: `/ K7 W5 H3 escribed by his family physician for decreased libido
1 Q' i! {6 ?: n' l! F+ r1 nsecondary to depression.
3 d1 R& f$ U2 x5 CThe child slept in the same bed with parents.* H/ G4 y& ~ ?$ D* s; D
The father would hug the baby and hold him on his0 }; d; E) t2 ?
chest for a considerable period of time, causing sig-0 e! J* n7 r, P, a
nificant bare skin contact between baby and father.& q* K7 f- w# o `8 ]
The father also admitted that after the phone call,
4 ?8 x' e! i7 C/ |when he learned the testosterone level in the baby3 |/ U$ f# T F4 C8 o1 L$ U
was high, he then read the product information
3 ^6 ~. G/ P. vpacket and concluded that it was most likely the rea-
6 O9 {# b3 M. _son for the child’s virilization. At that time, they/ k A1 D4 c; t3 T! [
decided to put the baby in a separate bed, and the
( F {$ w+ h1 K" i! d; O7 [father was not hugging him with bare skin and had% [1 J1 D6 g6 R( [3 F$ `3 C5 t
been using protective clothing. A repeat testosterone4 A o' [% i) m9 q0 g
test was ordered, but the family did not go to the
4 u3 O5 f# [7 llaboratory to obtain the test.
; @0 p! O# U& ]0 `9 a9 p: N$ N! DDiscussion. n3 q) x( [' u4 r
Precocious puberty in boys is defined as secondary& c$ {* R% ?# }9 a
sexual development before 9 years of age.1,40 V+ M9 M0 g S/ m
Precocious puberty is termed as central (true) when; P+ m6 Z4 C) i, a
it is caused by the premature activation of hypo-" \8 s( O T) ?6 s/ s' e
thalamic pituitary gonadal axis. CPP is more com-. M& S* r5 w4 P* H9 B7 D. A
mon in girls than in boys.1,3 Most boys with CPP9 U* l( X* f7 m g2 A! r
may have a central nervous system lesion that is- Y1 |% q2 R8 n
responsible for the early activation of the hypothal-
7 m7 ^8 ?, g7 H9 h9 P8 h% Hamic pituitary gonadal axis.1-3 Thus, greater empha-/ P# z3 S0 i8 B9 g: O5 m9 {
sis has been given to neuroradiologic imaging in
2 \2 M6 n/ _1 ?$ [boys with precocious puberty. In addition to viril-3 `( _0 {9 P, j7 D! W( e8 [
ization, the clinical hallmark of CPP is the symmet-, i3 ^/ ^: _0 |- o
rical testicular growth secondary to stimulation by; i$ _; I; {1 F# b8 E; Y
gonadotropins.1,34 H' \5 j: Z4 u& P
Gonadotropin-independent peripheral preco-
3 S1 F0 t( T0 {1 s$ L7 Wcious puberty in boys also results from inappropriate
+ z, L; [: c& N1 C6 L4 d* @: tandrogenic stimulation from either endogenous or; S' T" }: ]. t$ C& Y( e
exogenous sources, nonpituitary gonadotropin stim-
\- M5 }5 m2 N) b+ }ulation, and rare activating mutations.3 Virilizing
d w f; h& F# k& f; {5 acongenital adrenal hyperplasia producing excessive7 c/ g1 R7 n1 u. w7 V
adrenal androgens is a common cause of precocious
4 }7 A- g. j3 Y. o) O. Npuberty in boys.3,4
2 W4 _) v7 M: o, |1 {- a/ CThe most common form of congenital adrenal
0 Z) B6 ~# M' t, u! ^' chyperplasia is the 21-hydroxylase enzyme deficiency.8 e5 Y6 i @" s* E6 B7 E! J
The 11-β hydroxylase deficiency may also result in
4 [6 a* D7 w. ^- P; s/ Z# Hexcessive adrenal androgen production, and rarely,
+ F% J! `( M1 n2 Qan adrenal tumor may also cause adrenal androgen# G: B. [! X2 y" a
excess.1,3
( h% n5 Z$ n \7 C) nat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; z& t4 j# ^& o5 a5 p, A0 G542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
0 u. M. r1 X( wA unique entity of male-limited gonadotropin-
, M3 V0 k. S4 L) x* windependent precocious puberty, which is also known, W1 A& |* t( n+ l! p
as testotoxicosis, may cause precocious puberty at a
2 F! X3 d3 u* ? Hvery young age. The physical findings in these boys; I5 |; \1 d6 x. R( O. b
with this disorder are full pubertal development,
2 A( |6 X; {7 G/ m: y7 l% Iincluding bilateral testicular growth, similar to boys
7 V5 w1 V4 B: a5 p) a$ u! Uwith CPP. The gonadotropin levels in this disorder% F! D+ I& x/ Y5 J) I, c
are suppressed to prepubertal levels and do not show
; ?- F/ P4 r# G% Q" n8 S; cpubertal response of gonadotropin after gonadotropin-( J; R [5 i# L6 B" g4 i: v
releasing hormone stimulation. This is a sex-linked& @" v- X, I/ ^! c P
autosomal dominant disorder that affects only5 ~( P1 p0 D i# r; o4 n4 s# n! u" n; J
males; therefore, other male members of the family/ t! \& V' q1 x; V2 l
may have similar precocious puberty.3" y4 c, _9 f; E* ^
In our patient, physical examination was incon-# s& E& U. `# S' N; n
sistent with true precocious puberty since his testi-
* L [( h8 X- S% ^3 vcles were prepubertal in size. However, testotoxicosis/ g; i1 S! A. ]3 k
was in the differential diagnosis because his father2 t' w; P3 Z4 u/ m
started puberty somewhat early, and occasionally,1 Y9 a! |$ [6 z& C
testicular enlargement is not that evident in the
% X+ B; l$ A' @beginning of this process.1 In the absence of a neg-
; o7 m) b" u0 D& m5 B8 Aative initial history of androgen exposure, our" U$ ^% U9 @1 r' [8 ~+ v: v7 R
biggest concern was virilizing adrenal hyperplasia,7 m( _; ~" N' m8 P b
either 21-hydroxylase deficiency or 11-β hydroxylase; Z# G" v! |5 T9 E8 m* M: L3 s
deficiency. Those diagnoses were excluded by find-7 G( g; L5 `3 k: H0 n
ing the normal level of adrenal steroids.% Z5 _8 a; Q7 O; [* U* u
The diagnosis of exogenous androgens was strongly
4 e* L/ V3 z ^: k% A. ssuspected in a follow-up visit after 4 months because. ^& o2 A5 D% O; z( |: J3 j2 z+ j; h
the physical examination revealed the complete disap-
; w6 a# M+ p1 Z7 rpearance of pubic hair, normal growth velocity, and. s& P" }4 }6 u0 m4 R$ ]1 B
decreased erections. The father admitted using a testos-& M- d7 I c& `# l; H8 p
terone gel, which he concealed at first visit. He was
. ^! r; }6 C- Q) D2 `% Fusing it rather frequently, twice a day. The Physicians’( b C/ P% B @. h
Desk Reference, or package insert of this product, gel or
% [8 x+ ~1 O" h/ n! D. Scream, cautions about dermal testosterone transfer to
: ^2 E; B9 B0 n) [/ T4 A& R* R7 R4 xunprotected females through direct skin exposure.
4 S' L) ^8 u) ^4 q/ N" YSerum testosterone level was found to be 2 times the
* _( J2 }8 z% U/ S# i' B# L4 ubaseline value in those females who were exposed to. w1 t: n: C' F+ Q4 b8 r+ h
even 15 minutes of direct skin contact with their male k! H( P, Y0 E1 O2 T' u4 n
partners.6 However, when a shirt covered the applica-4 g1 |) C# O& E( F4 D' J
tion site, this testosterone transfer was prevented." p& T, g. P, {2 o y6 K! q) Y) m
Our patient’s testosterone level was 60 ng/mL,8 ?5 E" P2 Z$ |
which was clearly high. Some studies suggest that
4 D" {$ y3 x$ D# j% t8 p, idermal conversion of testosterone to dihydrotestos-
$ Z. n: I) T% e8 O+ b, P3 U- o" Hterone, which is a more potent metabolite, is more
4 ]% m' G" |$ \) i# P# Z: k1 ^5 Eactive in young children exposed to testosterone( O2 c: K% n2 p) i3 x
exogenously7; however, we did not measure a dihy-( l, e I- B& L
drotestosterone level in our patient. In addition to& p" y p/ B9 O8 C; E
virilization, exposure to exogenous testosterone in4 u* Q7 d; T; G5 i
children results in an increase in growth velocity and; |- M1 q8 A8 k$ S' i! W
advanced bone age, as seen in our patient.
; ?* ]6 p' U! g ]The long-term effect of androgen exposure during
" T0 ]& C8 i/ I- X" j! wearly childhood on pubertal development and final
6 Y, v7 h! L7 ?4 x! V+ N; \+ Eadult height are not fully known and always remain
# I, i k: \5 W$ ?1 G7 k$ ea concern. Children treated with short-term testos-
" p5 v+ s/ i9 i1 C* e* d2 Oterone injection or topical androgen may exhibit some- q4 h8 H5 P: I
acceleration of the skeletal maturation; however, after/ p, w3 U8 R# p' n% D
cessation of treatment, the rate of bone maturation
& A# Q2 [1 P- H( H8 ^9 }5 mdecelerates and gradually returns to normal.8,9
Z. l D5 Q6 I K1 B, m9 o9 jThere are conflicting reports and controversy
' T3 { T" \% e' vover the effect of early androgen exposure on adult7 w/ ~& B/ H! W4 g! F7 U
penile length.10,11 Some reports suggest subnormal
* d( o& w. k: Y, N, r2 q$ T' N2 Eadult penile length, apparently because of downreg-
1 U* I( b* F. e5 tulation of androgen receptor number.10,12 However,& [1 W% o. f* Z- {' L$ \3 k
Sutherland et al13 did not find a correlation between
+ Y/ m' s+ ~+ M( m" v! q5 Hchildhood testosterone exposure and reduced adult" U# X5 T; R' M9 C
penile length in clinical studies.8 e; K" h9 b7 V
Nonetheless, we do not believe our patient is
: X4 m6 x# P" f( J7 d! M6 W& z# a2 l agoing to experience any of the untoward effects from
6 v+ R1 n' j% N0 I+ o- v# x ~! q; rtestosterone exposure as mentioned earlier because
7 i* U+ i) \9 R1 [7 Z. F) b( C- z3 Rthe exposure was not for a prolonged period of time.2 r1 t- J) X. s0 Z& A
Although the bone age was advanced at the time of% x4 m0 R- ?9 n
diagnosis, the child had a normal growth velocity at
* X! c' T7 V' F6 `: t4 D6 J' Zthe follow-up visit. It is hoped that his final adult2 V* V3 d* G" q+ b8 H9 b! c( B
height will not be affected.
! j" f- _- ?6 T* jAlthough rarely reported, the widespread avail-
1 n c: v% j+ m4 [ability of androgen products in our society may7 g: ^1 o, _& j3 U
indeed cause more virilization in male or female$ {/ F9 o/ L {( A% h
children than one would realize. Exposure to andro-( |! O1 k9 n7 m3 D: }. h
gen products must be considered and specific ques-
9 v# U, [& s% }& y8 p$ Z' C Btioning about the use of a testosterone product or
9 v5 ]( W" T* ]. C; ~7 R" I' qgel should be asked of the family members during
2 F; X9 r1 O5 k- mthe evaluation of any children who present with vir-/ @# y& s8 o6 C1 w2 N9 O7 c7 [& S
ilization or peripheral precocious puberty. The diag-* s: D# a" O0 n y
nosis can be established by just a few tests and by9 Y. U' u! s+ w$ H4 S0 {
appropriate history. The inability to obtain such a
8 Y, D$ C. e# rhistory, or failure to ask the specific questions, may
0 V- p1 h) p6 V# J* o4 fresult in extensive, unnecessary, and expensive
2 R, ^% n k" L# w7 {investigation. The primary care physician should be/ k; G6 U$ A" j7 l" q$ q6 ]
aware of this fact, because most of these children0 L! x6 t% E& v( K7 I( t( ]' l+ g; H, r
may initially present in their practice. The Physicians’8 l$ O9 j6 F. P% Z' \6 ]
Desk Reference and package insert should also put a' c4 E8 A' |/ }
warning about the virilizing effect on a male or
, G" g" V: D0 }% wfemale child who might come in contact with some-
6 ^* ?/ [) D; Z0 gone using any of these products.: ]! }2 g, C% C% e8 l7 q
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. c5 T3 a" |& K: J6. Physicians’ Desk Reference. Androgel 1% testosterone,
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8 {0 X J/ q1 \+ g. J) r9 D7. Klugo RC, Cerny JC. Response of micropenis to topical
% p# G! C8 `6 t% o1 Y3 Dtestosterone and gonadotropin. J Urol. 1978;119:! ^% H. e) u2 Z0 u
667-668.
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