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is a significant concern for physicians. Central3 ?0 k5 q3 \ P9 q# I/ @
precocious puberty (CPP), which is mediated2 ? G/ v9 P! q5 \9 p+ S/ U) H
through the hypothalamic pituitary gonadal axis, has
* i( }% ?$ w: D% L0 Ga higher incidence of organic central nervous system
( d$ T& K Z# Mlesions in boys.1,2 Virilization in boys, as manifested
. W8 y3 Z0 ~8 V }. Q+ sby enlargement of the penis, development of pubic w% q5 L6 X& D2 L
hair, and facial acne without enlargement of testi-1 q, s2 b. J6 M4 Z4 O
cles, suggests peripheral or pseudopuberty.1-3 We' S7 K% X5 U& ^) W% X2 ?8 a
report a 16-month-old boy who presented with the
P0 U! a# \! I% d. z( z5 Q6 {enlargement of the phallus and pubic hair develop-/ l- r; c6 s" L9 I4 z! X
ment without testicular enlargement, which was due1 c$ E* R( H' J; s
to the unintentional exposure to androgen gel used by
# ~5 T# \' [, S+ i/ V* F1 Cthe father. The family initially concealed this infor-
; x8 q8 U2 L5 @" i5 _, }3 Kmation, resulting in an extensive work-up for this( I6 r6 W; g2 }; a
child. Given the widespread and easy availability of0 E8 @7 a# ?5 v
testosterone gel and cream, we believe this is proba-
1 H& ^7 \1 h1 m. |! w: U" hbly more common than the rare case report in the/ A6 }9 b! P) Z! K, I% l7 ?
literature.4
0 h8 I! k( Q o% tPatient Report
5 ?0 d' V* m0 x+ w6 bA 16-month-old white child was referred to the+ h, y) n: a* b2 ]
endocrine clinic by his pediatrician with the concern! y7 g) U. }0 o' [2 Y$ S
of early sexual development. His mother noticed, {9 t3 e0 P8 N7 |" D) M% O
light colored pubic hair development when he was1 k4 t9 h# f" p& D: @" {: w) o q
From the 1Division of Pediatric Endocrinology, 2University of" r# g% N. b( y' @8 }
South Alabama Medical Center, Mobile, Alabama.# H. k9 s' j6 O1 d. X# W; e
Address correspondence to: Samar K. Bhowmick, MD, FACE,
& M/ C+ K* F, eProfessor of Pediatrics, University of South Alabama, College of' w# G6 H# z2 _. V8 ]
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;( q1 n! n" w9 A4 c+ d P' T
e-mail: [email protected].
7 Y: D; G- u! C( W) X6 C" h1 B, _about 6 to 7 months old, which progressively became& H3 M- t/ C3 d6 d4 D5 ]% ^ L
darker. She was also concerned about the enlarge-! ?- M0 E. ?9 s) p' E
ment of his penis and frequent erections. The child" V, R$ m' B1 y/ k9 h0 p
was the product of a full-term normal delivery, with
0 f e& v' |! r- O; {% ]9 s3 ia birth weight of 7 lb 14 oz, and birth length of
6 e& o( G; |% ^0 a. ?20 inches. He was breast-fed throughout the first year! z- K5 k, k* B1 ]+ a4 |4 ]
of life and was still receiving breast milk along with
5 K7 R- W0 `8 W- }7 wsolid food. He had no hospitalizations or surgery, e. M0 `% r m
and his psychosocial and psychomotor development3 ]- F# }, C' `) N. p
was age appropriate.1 a" x+ ~' p6 j
The family history was remarkable for the father,
+ A( T0 f% U4 O4 {who was diagnosed with hypothyroidism at age 16,6 r8 ?: L1 C9 o: q, Y, s0 T6 x% u
which was treated with thyroxine. The father’s9 d6 {% q1 ~6 n+ X! _7 Q" h
height was 6 feet, and he went through a somewhat* Q$ m& ?, A! |8 s
early puberty and had stopped growing by age 14.: R5 }! l( j6 v1 p) i3 w4 A
The father denied taking any other medication. The' z5 M& B- G: _) {
child’s mother was in good health. Her menarche
9 j0 `! B! D/ N* d3 Ywas at 11 years of age, and her height was at 5 feet. c" Z$ Z1 x. [9 p' D
5 inches. There was no other family history of pre-
" d3 D& K" e' P1 Q I7 p/ vcocious sexual development in the first-degree rela-
/ |7 N' [1 X7 Q, L1 Q0 n+ Ktives. There were no siblings.
1 P9 P! _6 I5 |Physical Examination
* j) a. S0 @/ LThe physical examination revealed a very active,
8 _3 q- {0 @5 {) {playful, and healthy boy. The vital signs documented
2 C/ I4 ^ n/ J5 N2 c/ Oa blood pressure of 85/50 mm Hg, his length was
3 l% |& s. f: [( Y90 cm (>97th percentile), and his weight was 14.4 kg
- n! ~& C; D7 s) g" }(also >97th percentile). The observed yearly growth
, u9 H& ]( c% [7 |; [( P/ rvelocity was 30 cm (12 inches). The examination of
9 e: u3 ~4 u/ Fthe neck revealed no thyroid enlargement.5 s) k+ _. i. M. Z8 v
The genitourinary examination was remarkable for. C4 f* m8 R2 C. ]
enlargement of the penis, with a stretched length of
8 t4 M# H3 @2 I$ k# Q. C( p! U8 cm and a width of 2 cm. The glans penis was very well! p- s( W \; t" \* U
developed. The pubic hair was Tanner II, mostly around
) b( d8 v3 Q# D0 J540
' Y; |9 z( x7 H1 j7 Cat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from! w- T0 C( t2 c8 V7 y0 Y
the base of the phallus and was dark and curled. The
. z2 N: q' k; g2 Utesticular volume was prepubertal at 2 mL each.
; |. ~0 J# E3 BThe skin was moist and smooth and somewhat
0 A2 ^" y5 |, roily. No axillary hair was noted. There were no
9 q% k: H8 A# h G2 q: a/ Xabnormal skin pigmentations or café-au-lait spots.
2 z' c5 F0 |5 m" C! I9 i# XNeurologic evaluation showed deep tendon reflex 2+
7 K$ I- M O1 e, o; fbilateral and symmetrical. There was no suggestion, @; K- ?3 N/ ~" |+ q! Q
of papilledema.: K' O5 R3 z D" t! s
Laboratory Evaluation
1 D e8 Y! o6 o- A. l% _The bone age was consistent with 28 months by' B* _1 W0 @. ~6 Z. F/ W. s
using the standard of Greulich and Pyle at a chrono-
0 i& ], g0 R3 {; X3 Ilogic age of 16 months (advanced).5 Chromosomal2 v6 g$ I8 x2 l& w# g
karyotype was 46XY. The thyroid function test1 q) A/ w$ o4 X' V+ Y( P; E; j
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
+ r! r3 G7 x# j+ Llating hormone level was 1.3 µIU/mL (both normal).
1 m- Q& c( d% P% j/ @9 sThe concentrations of serum electrolytes, blood, u' a1 \3 Q* Z
urea nitrogen, creatinine, and calcium all were
7 Z* i" o/ Z) g# `+ M" n. qwithin normal range for his age. The concentration
0 v1 f) w, h! L: p+ x+ sof serum 17-hydroxyprogesterone was 16 ng/dL) w, D! T( w& [' M' X& G- [5 O9 C
(normal, 3 to 90 ng/dL), androstenedione was 20
, J: U1 q! e0 i" t z3 Fng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-* k, d0 s; ~8 O( K3 c+ Z" V* I
terone was 38 ng/dL (normal, 50 to 760 ng/dL),7 A, r1 ], E8 S; T' ~
desoxycorticosterone was 4.3 ng/dL (normal, 7 to7 ^ h( M. l( M' n2 a* V
49ng/dL), 11-desoxycortisol (specific compound S)
" i0 ~8 {) z! D+ S& |was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-( ~# d$ K8 P4 y; Q5 i/ \# ?- h
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
+ o1 L8 V; T2 Q# N# i: r' C; Ktestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
$ Z3 L) ^; z# fand β-human chorionic gonadotropin was less than m8 Z: u7 H) U% z, W g( M: N
5 mIU/mL (normal <5 mIU/mL). Serum follicular- c0 f0 {! T9 D' l
stimulating hormone and leuteinizing hormone
4 c9 g, i3 g7 Dconcentrations were less than 0.05 mIU/mL6 B: i1 A/ r8 }3 ]+ s
(prepubertal).
( @$ b8 ]/ Q$ v% CThe parents were notified about the laboratory7 E# U! r! ~; X6 v3 e
results and were informed that all of the tests were
9 n6 n" V \/ v$ ^9 ?; d9 [3 v' j1 ynormal except the testosterone level was high. The
z2 M* @. O' {* C, l: Kfollow-up visit was arranged within a few weeks to
5 T% j0 d; O7 zobtain testicular and abdominal sonograms; how-% k# L( O) N6 f( |
ever, the family did not return for 4 months.8 `+ w/ T6 e" r8 o9 Z
Physical examination at this time revealed that the8 H# w- o. G0 [, V. |0 y
child had grown 2.5 cm in 4 months and had gained! y' r* |" \. a: \3 h( g6 j1 q
2 kg of weight. Physical examination remained
' x. A$ C3 V: K2 p3 D2 B( K1 C2 Gunchanged. Surprisingly, the pubic hair almost com-5 Q. h# k" D! {
pletely disappeared except for a few vellous hairs at
, o- q1 h9 a. A' u; ^the base of the phallus. Testicular volume was still 2; Z. n0 S2 ]/ j4 }+ z$ g* G
mL, and the size of the penis remained unchanged./ t4 F3 D) V( m. P+ Z* J( a
The mother also said that the boy was no longer hav-
) E6 X) C! J& k% ] A& ~ Ving frequent erections.7 N- @7 L5 O$ A) |' R3 M5 c
Both parents were again questioned about use of
' u* e: A7 i2 R9 `' D; `any ointment/creams that they may have applied to
! d) h2 a Y, Cthe child’s skin. This time the father admitted the( M" g7 A; a- m& z A, {3 J
Topical Testosterone Exposure / Bhowmick et al 541
3 N. @6 s2 c- b' ?0 Xuse of testosterone gel twice daily that he was apply-
3 R" v2 h$ n/ n* wing over his own shoulders, chest, and back area for
/ e: V: N1 b" F* G+ ?a year. The father also revealed he was embarrassed
1 C4 [% K% G! Q; Cto disclose that he was using a testosterone gel pre-
) \0 y# L4 D. Q1 Jscribed by his family physician for decreased libido& b7 V$ K. {# ]0 _: B, m
secondary to depression.8 @% A5 Z0 ~5 H* \6 r0 |
The child slept in the same bed with parents.
! R. l4 R6 O8 H2 E. a" v& QThe father would hug the baby and hold him on his
- a U; A v$ c1 L7 vchest for a considerable period of time, causing sig-
0 M; Y: S( ^9 Knificant bare skin contact between baby and father.2 h, p" A6 r& b, {5 o, d
The father also admitted that after the phone call,
$ E5 Y/ Y/ s& }0 `( v! ]when he learned the testosterone level in the baby
5 |" S: h1 P1 t' awas high, he then read the product information
" t& k4 j$ c' Y7 G* i; g' f6 r$ Zpacket and concluded that it was most likely the rea-
) K$ L- H3 g8 ?. N# R: w0 F( w& S2 eson for the child’s virilization. At that time, they: n; \& v3 W0 \. ?/ e" M
decided to put the baby in a separate bed, and the6 p1 j3 }5 N8 _0 d) r0 W
father was not hugging him with bare skin and had* E0 `' }# P, w( I: [
been using protective clothing. A repeat testosterone
* U- }) m- S3 s. G% }; }/ }test was ordered, but the family did not go to the0 B R4 i6 Q7 P) U, \, ^
laboratory to obtain the test." _5 b* I2 S: A7 b3 P- B0 V X
Discussion5 P. f4 e/ j7 N" B7 k a/ `
Precocious puberty in boys is defined as secondary3 `8 f3 \0 @: Y3 y4 \* x( w
sexual development before 9 years of age.1,4- u+ S! B+ u; O* i* o. H# v
Precocious puberty is termed as central (true) when
& a5 R; t% t. I- S& @$ Pit is caused by the premature activation of hypo-' F7 X( p% } F/ z* J; k/ K% J
thalamic pituitary gonadal axis. CPP is more com-* T- s4 h6 @& O" e0 L1 H9 ?3 F: i
mon in girls than in boys.1,3 Most boys with CPP
$ b. K# G' {% q* f# P5 }may have a central nervous system lesion that is
6 E9 `0 b6 Z' l3 \4 b/ w- n zresponsible for the early activation of the hypothal-" B# g" H; W: c' \
amic pituitary gonadal axis.1-3 Thus, greater empha-
* Q0 D1 A6 I4 }2 c2 Nsis has been given to neuroradiologic imaging in; V% Q: N _9 _
boys with precocious puberty. In addition to viril-' _5 A$ p2 ]- {4 M% X
ization, the clinical hallmark of CPP is the symmet-
) N+ z' c) [% t2 }. C' Orical testicular growth secondary to stimulation by9 l7 [6 s8 a* n0 K4 A4 _
gonadotropins.1,3
+ U3 e6 ^; E7 R) iGonadotropin-independent peripheral preco-" h2 v& }( a. D# w. X2 r7 I
cious puberty in boys also results from inappropriate: X! X1 O5 _. w7 p2 I6 T G1 |
androgenic stimulation from either endogenous or
; G6 X1 d' f/ n W+ G* Vexogenous sources, nonpituitary gonadotropin stim-3 l2 \$ S8 T9 E( T
ulation, and rare activating mutations.3 Virilizing
9 v3 @6 D+ l- d' L0 Y: }5 Fcongenital adrenal hyperplasia producing excessive8 H. y( X7 ^+ O* x, E" ^* @4 Z, t
adrenal androgens is a common cause of precocious
5 d6 [" t0 ^7 fpuberty in boys.3,4
. D. H: f% @" ?2 w9 W. ^% MThe most common form of congenital adrenal
. J3 |! G& F! Rhyperplasia is the 21-hydroxylase enzyme deficiency.
% d- d# H* w8 j1 j6 hThe 11-β hydroxylase deficiency may also result in' y j* l+ d3 j% B* K8 B# O
excessive adrenal androgen production, and rarely,; ~7 k, Y+ l: z& ]3 s4 \1 r
an adrenal tumor may also cause adrenal androgen3 o3 }: i7 ^( a
excess.1,3
6 i! i a; h1 U& m1 H% s# qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ X& c9 T T. `542 Clinical Pediatrics / Vol. 46, No. 6, July 20070 p! `" H+ `' o/ P& v" {4 e
A unique entity of male-limited gonadotropin-
/ ?# o0 H; h( E9 C6 c" p+ B/ Vindependent precocious puberty, which is also known: X" c4 E: W8 _; L
as testotoxicosis, may cause precocious puberty at a
3 H6 E8 r4 h& y M; vvery young age. The physical findings in these boys1 V) Y# \) `5 J- X* w
with this disorder are full pubertal development,! N) @# @# O- ^, N& X- E* @
including bilateral testicular growth, similar to boys
6 _7 o" V1 b8 G8 m6 ]5 Zwith CPP. The gonadotropin levels in this disorder4 `" ^: Q1 ~0 t
are suppressed to prepubertal levels and do not show* N9 @- A( P" A9 G; e* @
pubertal response of gonadotropin after gonadotropin-
( _3 i0 W/ E" G: g6 kreleasing hormone stimulation. This is a sex-linked
v3 X* t1 {) { f1 E1 Tautosomal dominant disorder that affects only: V& i& `* x z0 z6 m; C
males; therefore, other male members of the family
$ q: ~" P. t- N, }: Vmay have similar precocious puberty.3; k) C7 @* p; o' J, \9 [% D6 H1 U: U
In our patient, physical examination was incon-7 a. ]& Y; B1 ?
sistent with true precocious puberty since his testi-
8 U& T* [5 ^! L2 Kcles were prepubertal in size. However, testotoxicosis$ [9 X4 d' b# B& b; w, D$ T
was in the differential diagnosis because his father3 G& {/ @; M7 |" e! ]
started puberty somewhat early, and occasionally,) x S* p1 O' k# V. f' r6 b5 ?* e
testicular enlargement is not that evident in the9 x; f/ M2 i0 B0 K6 T/ B# ^' g. s: P
beginning of this process.1 In the absence of a neg-5 j0 }$ G) p. }: h
ative initial history of androgen exposure, our
1 o! W2 ^1 Z/ K: d' j# H T5 lbiggest concern was virilizing adrenal hyperplasia,# U. u. }, l1 X+ Y( k. Q* U( u
either 21-hydroxylase deficiency or 11-β hydroxylase2 [- Y" t4 k/ M; Q! J$ S
deficiency. Those diagnoses were excluded by find-% u$ |7 G6 f: h0 K3 c5 R
ing the normal level of adrenal steroids.0 C5 C# w9 i0 a* Q3 D
The diagnosis of exogenous androgens was strongly- K4 ?% Z: ^: j" M9 J6 k% ~, x
suspected in a follow-up visit after 4 months because
7 g2 J. }" F m) Z1 B) _; ithe physical examination revealed the complete disap-
o4 E; y# U& e9 C+ W: I# l+ ppearance of pubic hair, normal growth velocity, and
/ i1 r7 w0 i- N4 e4 Ndecreased erections. The father admitted using a testos-
5 X+ ~! J- i5 u6 k% Wterone gel, which he concealed at first visit. He was
( u# P( V0 l9 u7 T# O; `+ y' Yusing it rather frequently, twice a day. The Physicians’
$ I7 c* f7 ?" L( JDesk Reference, or package insert of this product, gel or% D' ?" I6 s% @4 m Y
cream, cautions about dermal testosterone transfer to
, Y- b: y% I" U* `unprotected females through direct skin exposure.3 C$ W5 t G# l: E& W
Serum testosterone level was found to be 2 times the2 `( ^/ h3 z5 c
baseline value in those females who were exposed to( u6 j* M$ P" }' @# c
even 15 minutes of direct skin contact with their male
0 D6 {5 `& l/ E- p. k+ epartners.6 However, when a shirt covered the applica-
# N. F# `' {2 @4 K/ m6 k. ction site, this testosterone transfer was prevented.
+ F- u2 Y3 P2 e# iOur patient’s testosterone level was 60 ng/mL,
. k, q6 b+ b- N& u. bwhich was clearly high. Some studies suggest that
2 n0 x& v# W! |) [/ g! cdermal conversion of testosterone to dihydrotestos-; D$ a+ w1 r2 U3 Z r6 ~- W
terone, which is a more potent metabolite, is more
6 c' L8 U @3 T$ u: }active in young children exposed to testosterone. h2 R. q- M% p
exogenously7; however, we did not measure a dihy-" y. S% ^: I2 m8 w8 w
drotestosterone level in our patient. In addition to
2 a( I+ C9 e$ x2 M$ c- B( p+ s' z6 nvirilization, exposure to exogenous testosterone in- p; K; G5 b" [$ k
children results in an increase in growth velocity and
; q8 z+ I: D! R! `- iadvanced bone age, as seen in our patient.+ \' ^5 Y+ L. R8 q
The long-term effect of androgen exposure during
' C' _8 \3 P) x0 r4 i! pearly childhood on pubertal development and final @2 t9 K" D: _, u
adult height are not fully known and always remain
) H# u/ D, _) va concern. Children treated with short-term testos-0 ~0 k! _% c1 G' {1 S9 C2 _
terone injection or topical androgen may exhibit some1 \6 T+ ^, ]! k" Y7 `$ S
acceleration of the skeletal maturation; however, after, `& j0 h' m8 w. Z2 ~
cessation of treatment, the rate of bone maturation4 f- _. |$ J/ s5 l) R. f7 W
decelerates and gradually returns to normal.8,9
/ j- S- E8 v$ |- _There are conflicting reports and controversy( B% a9 \: {: e
over the effect of early androgen exposure on adult
( W/ o5 b/ e" J) @3 wpenile length.10,11 Some reports suggest subnormal# r5 C$ f! N0 ^! X/ R$ o6 q
adult penile length, apparently because of downreg-4 R8 y m6 M9 v O/ l3 u* C
ulation of androgen receptor number.10,12 However,
- e: @. `* ^/ iSutherland et al13 did not find a correlation between
0 \' X! |- @9 r3 X% |9 jchildhood testosterone exposure and reduced adult
2 ?! L# l2 j; f v4 F: j7 ppenile length in clinical studies.+ x8 x( z9 [3 ~, C) h5 }' p
Nonetheless, we do not believe our patient is
8 e$ S! u- `, d& Z3 h N1 p% Igoing to experience any of the untoward effects from
+ w! F8 P, S& A( Otestosterone exposure as mentioned earlier because
- N4 j+ @0 h0 fthe exposure was not for a prolonged period of time., ]% ^! Q/ G: |9 H! o
Although the bone age was advanced at the time of
$ T' U: [: e. o8 @diagnosis, the child had a normal growth velocity at; o# Z9 Q9 ^. w2 z" x* W
the follow-up visit. It is hoped that his final adult5 S" p) n' f1 d. i" s
height will not be affected.
' Q. i! y+ a& f( P& V$ pAlthough rarely reported, the widespread avail- n0 ~: V! C' y5 d
ability of androgen products in our society may
) L+ C- V2 @1 p s7 ~indeed cause more virilization in male or female
2 r7 ?4 `6 B1 c+ i6 ]' ~children than one would realize. Exposure to andro-6 U7 B: e [, s! Z7 `( B; q2 g0 h
gen products must be considered and specific ques-
/ k! ~( }9 e( utioning about the use of a testosterone product or- u3 B e3 X( `- v
gel should be asked of the family members during) L1 [5 p4 K; f: O
the evaluation of any children who present with vir-
& \/ n) q$ w1 r+ z4 M" ]* m% oilization or peripheral precocious puberty. The diag-
, C2 {( q8 ^3 p4 Wnosis can be established by just a few tests and by
- @+ u. [: m4 H0 |$ z' iappropriate history. The inability to obtain such a0 l( [0 b% j5 d/ S' M5 g% p* \
history, or failure to ask the specific questions, may* I0 Q0 t+ n$ e' U5 S* k# ^
result in extensive, unnecessary, and expensive
4 |4 W; p: \3 Ainvestigation. The primary care physician should be2 s4 Z+ E5 n& N2 Q
aware of this fact, because most of these children
7 |+ T: ]% p$ w- \may initially present in their practice. The Physicians’
& g, P- l1 N: D |3 b& w2 }6 VDesk Reference and package insert should also put a; x# }- V& q, P, `" a( q
warning about the virilizing effect on a male or5 n/ z9 Z" F1 u
female child who might come in contact with some-
2 J! ^% }- P3 W B; rone using any of these products.1 X9 b5 D1 t( r* U7 A% e
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) p2 [' i/ E6 X) J8. Guthrie RD, Smith DW, Graham CB. Testosterone2 \+ G! L) I% {0 W* I- g4 j* d1 _
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