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is a significant concern for physicians. Central
: \- h2 K( y5 C/ I* wprecocious puberty (CPP), which is mediated* Y K* Z( G- {9 B' L1 h
through the hypothalamic pituitary gonadal axis, has# ?( k$ x9 q5 ^" P9 V+ A7 @! Y
a higher incidence of organic central nervous system4 b7 l% }9 q7 k0 a
lesions in boys.1,2 Virilization in boys, as manifested
( D6 O7 @6 z2 f: a r% u3 Eby enlargement of the penis, development of pubic
& w0 R, l. i5 `hair, and facial acne without enlargement of testi-
9 L( a2 g) o. j% P" `( ~cles, suggests peripheral or pseudopuberty.1-3 We
! \2 [) L& `* N5 Y. ?5 K5 Wreport a 16-month-old boy who presented with the/ Q/ r" ^& A; z. g V
enlargement of the phallus and pubic hair develop-: I! \" z: Y$ _/ O, u* r
ment without testicular enlargement, which was due
$ U% }2 h6 y: h9 e% B: z& Nto the unintentional exposure to androgen gel used by
6 E/ L: \8 q; [) h( lthe father. The family initially concealed this infor-, m, A9 P. A. @
mation, resulting in an extensive work-up for this1 L8 C' V8 y! s9 S% I c
child. Given the widespread and easy availability of K' m( w; ^) p& U
testosterone gel and cream, we believe this is proba-
; o* @6 ^ w+ a' X+ bbly more common than the rare case report in the
5 Q. f. Q6 e( Sliterature.4) T& O2 X! \2 T! I- U. l {3 f
Patient Report- P2 K' |9 q, `& \ |' t1 o
A 16-month-old white child was referred to the- n) o. n, O5 w; u4 P" l5 b& Z/ i- Y
endocrine clinic by his pediatrician with the concern
6 R) z3 L! A# l! I0 ]' Nof early sexual development. His mother noticed' a) ?! b( R! {# q2 @
light colored pubic hair development when he was
1 @3 E. @* Y. w/ [1 i# [From the 1Division of Pediatric Endocrinology, 2University of
& h2 m" p, v4 z( \# dSouth Alabama Medical Center, Mobile, Alabama.
, Q1 }% r( B( S1 z. dAddress correspondence to: Samar K. Bhowmick, MD, FACE, g% X( q T1 Z ^9 a
Professor of Pediatrics, University of South Alabama, College of: ` D+ N+ i% B; m
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
5 {& R1 d6 p) n* ^1 E4 L6 _e-mail: [email protected].
4 p/ E) |) j5 Z9 Y) M" O( Jabout 6 to 7 months old, which progressively became
) l+ @8 Q; n' h" Hdarker. She was also concerned about the enlarge-
- @, t/ ^0 Z* k3 R% Q9 yment of his penis and frequent erections. The child6 N5 z( t1 Q6 |
was the product of a full-term normal delivery, with8 G+ J+ K! s% c9 H; r3 |
a birth weight of 7 lb 14 oz, and birth length of
# V# {5 y: N! P7 U1 T ]. V& x20 inches. He was breast-fed throughout the first year0 Z; f( H2 ^! k: U
of life and was still receiving breast milk along with
, ^+ S9 F$ Q7 n, Asolid food. He had no hospitalizations or surgery,% e! e8 C# n6 r/ K% A$ p, J
and his psychosocial and psychomotor development+ v. h7 c8 w; A1 O3 g. k
was age appropriate.
. s8 k: I9 z d% U; v7 ~& @The family history was remarkable for the father,
1 P7 b: i) P1 V; \% iwho was diagnosed with hypothyroidism at age 16,
; V, f6 I- j) s/ _8 q; [& Xwhich was treated with thyroxine. The father’s
5 J- P6 ?# d& T& d/ F* sheight was 6 feet, and he went through a somewhat
( }$ ^5 D9 O7 B/ bearly puberty and had stopped growing by age 14.
# D: o+ q: C" l7 v2 d% e6 |" XThe father denied taking any other medication. The
0 C% [0 a* ^9 b1 R7 J; xchild’s mother was in good health. Her menarche
& y/ K0 I3 ?/ s1 owas at 11 years of age, and her height was at 5 feet* N6 A9 ~' V9 ^& u% p; ]7 y
5 inches. There was no other family history of pre-
; ^3 q& a5 n8 [# V ~cocious sexual development in the first-degree rela-+ V3 D e0 p& Z
tives. There were no siblings.
3 H) a& g( Q) q) @' d+ l5 C4 pPhysical Examination
* U2 I! A2 x* L" U' ~* ~The physical examination revealed a very active,
) T4 n0 p9 o7 f0 K1 \! aplayful, and healthy boy. The vital signs documented
3 n% B! c; o' d% }* E" N Sa blood pressure of 85/50 mm Hg, his length was9 I: l) j6 J7 N" h/ [
90 cm (>97th percentile), and his weight was 14.4 kg
/ |& w3 F" R0 ~(also >97th percentile). The observed yearly growth
, n: K+ f* V0 wvelocity was 30 cm (12 inches). The examination of
4 x- s: p( S) ]/ v5 othe neck revealed no thyroid enlargement.: ^" X1 u M% H5 Y& j: x6 n5 X
The genitourinary examination was remarkable for/ Y+ I; Z/ p9 q
enlargement of the penis, with a stretched length of
7 X' Q/ G3 O6 l( o+ _9 }8 cm and a width of 2 cm. The glans penis was very well. A! o: f- l8 Z2 t1 A Y3 n
developed. The pubic hair was Tanner II, mostly around3 Z2 s8 b. V, h; o0 x' D
540
. [+ j3 f0 k: K @3 j" hat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from9 w/ u! M x, r! Y
the base of the phallus and was dark and curled. The; _! M$ e% g2 z' \9 l9 ?+ ^& J
testicular volume was prepubertal at 2 mL each./ |' ^* u( r4 }! n( R( t0 v2 d
The skin was moist and smooth and somewhat
" g5 S: L: y4 _7 B) }oily. No axillary hair was noted. There were no( g0 f# U! P! O3 x# T3 K- [
abnormal skin pigmentations or café-au-lait spots.$ L2 m; Q& v$ T- H/ f; I k
Neurologic evaluation showed deep tendon reflex 2+
4 i7 M# B# u9 v; o$ Wbilateral and symmetrical. There was no suggestion% s+ x% q, m" X- [, W" P1 d3 h
of papilledema.5 W# r) [4 V9 {* E4 e! z
Laboratory Evaluation
1 D' U7 s4 ?/ Q, o/ d2 |The bone age was consistent with 28 months by
$ f3 ]6 p9 j8 `; p- ]/ Qusing the standard of Greulich and Pyle at a chrono-/ H: A9 N/ B0 M* g: \+ H
logic age of 16 months (advanced).5 Chromosomal
0 Q- M% |, {6 N* u, V& ~8 _karyotype was 46XY. The thyroid function test! B; S4 c5 j" f4 X2 E9 X |
showed a free T4 of 1.69 ng/dL, and thyroid stimu-% V; P8 U: D4 @: P7 ^2 k$ s( D
lating hormone level was 1.3 µIU/mL (both normal).
0 F4 |$ y# m* x, {, qThe concentrations of serum electrolytes, blood
. W( ~" ]5 H& Purea nitrogen, creatinine, and calcium all were
$ `+ a1 p+ {& {) F8 }. }4 ywithin normal range for his age. The concentration
( a# {' m9 c" O$ v( q5 e$ iof serum 17-hydroxyprogesterone was 16 ng/dL6 j l! T, U& P8 v! e
(normal, 3 to 90 ng/dL), androstenedione was 20, |$ D6 c5 Z" d: _+ m7 g$ C
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
8 m8 b- D! }3 e) X& sterone was 38 ng/dL (normal, 50 to 760 ng/dL),% P3 {4 ]( a6 \, C( d
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
3 E& p8 A! D/ z O49ng/dL), 11-desoxycortisol (specific compound S)
- h3 b7 \. B( i; p* |( F. g6 gwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-. n/ R! u0 J% A* B. _4 Y4 _5 z
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
* Q9 ?$ j- y- V7 Y: \5 Qtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
; f6 |/ N' B! o! N8 w0 land β-human chorionic gonadotropin was less than# h, a) ~: b( D @% Z/ @
5 mIU/mL (normal <5 mIU/mL). Serum follicular$ N; m9 { D: h; }4 K' B
stimulating hormone and leuteinizing hormone
7 Z# x5 p& _# l L3 I5 Econcentrations were less than 0.05 mIU/mL
. ]' C$ C0 e. x(prepubertal).' h- C( |/ s$ M/ \0 e
The parents were notified about the laboratory4 v& r0 E1 C( [) w7 n/ R7 ?& G; t: m
results and were informed that all of the tests were/ r$ F: T+ y+ v+ p0 J7 E% P
normal except the testosterone level was high. The4 I5 p* F2 U, |: P0 [6 T
follow-up visit was arranged within a few weeks to
$ h6 G4 I2 k# r" u8 w( k6 Vobtain testicular and abdominal sonograms; how-
1 |+ u, W+ e8 W! e# B: S. Tever, the family did not return for 4 months.9 g. {7 c3 [. Q# C7 i. u+ U
Physical examination at this time revealed that the- k/ y5 p2 N+ E+ o t& o
child had grown 2.5 cm in 4 months and had gained/ n2 o8 ~; j7 [' {7 ]' n
2 kg of weight. Physical examination remained l) t) o, q5 t
unchanged. Surprisingly, the pubic hair almost com-1 {8 d) {" v# W- i. k* u. b
pletely disappeared except for a few vellous hairs at
1 k2 M+ r9 m% {: o- z: mthe base of the phallus. Testicular volume was still 2
3 M7 W L1 Q. K/ w% smL, and the size of the penis remained unchanged.
, b7 f/ }: \" M0 `! {The mother also said that the boy was no longer hav-
; U" z+ q2 p, Z. S6 Ging frequent erections.1 i! N& X4 \8 i2 R% L
Both parents were again questioned about use of
: F! b- Y! m2 [% f; e+ O% l m2 L dany ointment/creams that they may have applied to$ `. }" Q7 G9 ?5 n- R
the child’s skin. This time the father admitted the- C0 a' ?% L" [0 M
Topical Testosterone Exposure / Bhowmick et al 541
# q3 I% n1 l2 ^2 Zuse of testosterone gel twice daily that he was apply-
/ k# ]1 P5 v# G3 j1 Ting over his own shoulders, chest, and back area for: q+ Y) N2 B c) c5 u8 }
a year. The father also revealed he was embarrassed
( I9 ?2 H6 k" k8 {7 d; {% uto disclose that he was using a testosterone gel pre-- X. C& ]0 @# i* O
scribed by his family physician for decreased libido4 C' f# E4 j, {2 V9 ~
secondary to depression./ D: {' M3 C9 u6 [8 \
The child slept in the same bed with parents.
% W' t' y$ k8 m4 ^& s: xThe father would hug the baby and hold him on his
* H6 ?' @' \9 { k5 Uchest for a considerable period of time, causing sig-9 ^+ R) z& x8 S
nificant bare skin contact between baby and father." f+ C3 U3 U0 U4 F w+ R. Q& ^
The father also admitted that after the phone call,! e% x4 ?3 i' [! Z& l! ?5 d
when he learned the testosterone level in the baby
, s9 B7 T+ m8 wwas high, he then read the product information
% C W x* F& g2 mpacket and concluded that it was most likely the rea-
0 e9 M! S- c1 y: Q+ L5 \son for the child’s virilization. At that time, they1 u. V4 x1 |9 {0 i ?
decided to put the baby in a separate bed, and the2 j/ t Y% F% A! \3 {* q ]
father was not hugging him with bare skin and had6 j- u7 e% A9 D: Y
been using protective clothing. A repeat testosterone" W8 x8 Z, m- N+ P7 p# k/ u
test was ordered, but the family did not go to the
' v6 C8 b+ h, O y+ u# j( Ulaboratory to obtain the test.
& E6 k' t( y" `/ w3 K( {% q6 d# ]Discussion
. L. b) w! q) \Precocious puberty in boys is defined as secondary
1 m1 s( Q; m& n+ m4 lsexual development before 9 years of age.1,47 B: u- V! r) R2 ~
Precocious puberty is termed as central (true) when
) [ K$ l a' p+ a' m* E6 iit is caused by the premature activation of hypo-# x9 u2 u% {! ?& ], k
thalamic pituitary gonadal axis. CPP is more com-/ \0 r3 K4 `% z/ M8 d9 }
mon in girls than in boys.1,3 Most boys with CPP
% q( Z9 o/ Q+ I3 k& ]0 ymay have a central nervous system lesion that is" G1 r5 Q( M: [1 V' e
responsible for the early activation of the hypothal-: c L( v6 R. z+ ?
amic pituitary gonadal axis.1-3 Thus, greater empha-6 l! P9 ?, T0 S- d
sis has been given to neuroradiologic imaging in
9 z& B+ h' W3 w* ]2 rboys with precocious puberty. In addition to viril-* S% Z4 C6 C; {
ization, the clinical hallmark of CPP is the symmet-+ z4 Z3 x- H1 [
rical testicular growth secondary to stimulation by2 A) N! w$ U# A2 p6 [! k
gonadotropins.1,3
6 N# O( M& I+ T% XGonadotropin-independent peripheral preco-7 q# q4 e( E3 B3 [
cious puberty in boys also results from inappropriate3 P) e3 {) f. T c6 {% K, ?! F
androgenic stimulation from either endogenous or2 z+ |) |# j- y( E9 ]- |
exogenous sources, nonpituitary gonadotropin stim- a" p" X, Y) J3 V7 o
ulation, and rare activating mutations.3 Virilizing0 O' Z, F; R9 t4 ]# p& A
congenital adrenal hyperplasia producing excessive0 |* Q1 { {" R j4 X, G
adrenal androgens is a common cause of precocious% W! T. L+ X; w6 [1 u9 X* I. n6 {
puberty in boys.3,48 h% G% }3 G+ n( D8 ?5 C5 f4 N4 \
The most common form of congenital adrenal4 V% y% X4 Q. b0 h7 N" }6 A+ O
hyperplasia is the 21-hydroxylase enzyme deficiency.& S1 C r1 Z/ V+ ^' g
The 11-β hydroxylase deficiency may also result in- c: a( X; S/ A% v" n$ V
excessive adrenal androgen production, and rarely,
' O$ T! ~8 _% A5 oan adrenal tumor may also cause adrenal androgen) L3 R( }: r! d% m3 A) R4 C
excess.1,32 ?/ W; _7 E5 k; y2 m9 l
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from( r: A7 p2 G) |+ E1 I
542 Clinical Pediatrics / Vol. 46, No. 6, July 20074 N. y+ @# }! t8 C
A unique entity of male-limited gonadotropin-
- W( `; J t/ N& P- a: |2 jindependent precocious puberty, which is also known
: ^6 d+ _0 |! p% n. |6 K* _) d' Qas testotoxicosis, may cause precocious puberty at a1 q' V- y8 o4 c( J/ \" n' R
very young age. The physical findings in these boys8 T) s( e4 _: R& N! f$ M* t" C
with this disorder are full pubertal development, U+ `( C2 T" |( Y
including bilateral testicular growth, similar to boys
! a/ C$ H! U7 L# A1 }with CPP. The gonadotropin levels in this disorder9 f$ y7 ]! E: c8 Z) ]
are suppressed to prepubertal levels and do not show
9 I9 Z5 ^2 Z! O8 J' k" {pubertal response of gonadotropin after gonadotropin-
, g$ S. p) p: W# k, Preleasing hormone stimulation. This is a sex-linked
, ~2 C% h( V; e9 zautosomal dominant disorder that affects only
! v# k+ D( W8 o8 r& D; I$ ]9 kmales; therefore, other male members of the family
A) P. \+ d8 @' J. I6 U7 R% omay have similar precocious puberty.3/ a+ R, `* k) u
In our patient, physical examination was incon-
: ~8 j3 d. m5 z) D+ \1 [8 esistent with true precocious puberty since his testi-: t( k- w. C8 z. b( M' ]3 a. q
cles were prepubertal in size. However, testotoxicosis; a/ v6 `( U0 S; d3 m* W4 ?
was in the differential diagnosis because his father
# _ C" }. R# |2 g$ jstarted puberty somewhat early, and occasionally,
- P( C6 m6 b0 S- P3 R; B: C: u- x9 rtesticular enlargement is not that evident in the5 Z% `1 x4 n2 m# ^" g8 \7 j- h. D5 @
beginning of this process.1 In the absence of a neg-) ~: N. S5 X% o8 j. A8 R! x
ative initial history of androgen exposure, our
! _- @; \- U9 W( Zbiggest concern was virilizing adrenal hyperplasia,
~$ d) Y1 B& O6 u' V3 m$ r! eeither 21-hydroxylase deficiency or 11-β hydroxylase' u% o; Y" e8 R* T: j) B. j1 u
deficiency. Those diagnoses were excluded by find-
# D! D3 I. P* c0 _& cing the normal level of adrenal steroids.
8 y+ ]* D' A9 K% _, sThe diagnosis of exogenous androgens was strongly
! Y6 K8 Z7 o3 r) ?- Ysuspected in a follow-up visit after 4 months because0 [4 }1 E! D3 K7 x q, L
the physical examination revealed the complete disap-
1 ]: H( W5 ]: k& O, apearance of pubic hair, normal growth velocity, and% u' Z8 w- N% b
decreased erections. The father admitted using a testos-
8 m1 C" z3 l3 l- b/ j4 m- qterone gel, which he concealed at first visit. He was- N U J! _4 |3 _- e% d3 _) {
using it rather frequently, twice a day. The Physicians’# D/ c/ W) k: V% |, m3 n
Desk Reference, or package insert of this product, gel or0 k1 q B3 q$ C
cream, cautions about dermal testosterone transfer to" Q" P* I, [/ d* ?: H# B
unprotected females through direct skin exposure.
4 k1 e9 l7 K7 g. TSerum testosterone level was found to be 2 times the
% i" T3 E z8 I8 e' g3 s1 M; `' Ubaseline value in those females who were exposed to$ y! @7 s8 F8 z' p q/ c
even 15 minutes of direct skin contact with their male
* O+ }; i" n$ g) s+ T: Qpartners.6 However, when a shirt covered the applica-" m8 o; x$ Q( g1 i% W/ d" N0 d2 |2 ^
tion site, this testosterone transfer was prevented.
- ]$ a% Y( l: K g) lOur patient’s testosterone level was 60 ng/mL,2 P$ F6 ]" K- ]$ a9 [3 t
which was clearly high. Some studies suggest that% h: v3 s, g( k; L! h: Y$ D5 R, r
dermal conversion of testosterone to dihydrotestos-
& M7 _: ~1 n& O1 d: n% oterone, which is a more potent metabolite, is more
9 n- V, a3 D/ u# V* O$ E( Tactive in young children exposed to testosterone7 k" O/ u- y$ p3 X/ r" U
exogenously7; however, we did not measure a dihy-
# K) H) M- `2 `2 ddrotestosterone level in our patient. In addition to
1 a i, F; _4 I3 v) O6 G Rvirilization, exposure to exogenous testosterone in- Y- M7 W: k6 Z, A9 U9 d
children results in an increase in growth velocity and
# o; M1 ^* [- ?" ^2 j" Zadvanced bone age, as seen in our patient.
. \- r$ i* j; n! LThe long-term effect of androgen exposure during" H& o l g' Y/ H, D4 z. {/ W
early childhood on pubertal development and final% p- l# h$ q8 C6 x% y _1 L( Q6 K
adult height are not fully known and always remain% a7 s: O! N( p, a! C* D
a concern. Children treated with short-term testos-
1 M( g, \1 O2 Z8 w" v& K4 xterone injection or topical androgen may exhibit some V+ t* s' d2 y
acceleration of the skeletal maturation; however, after5 {2 d" `; V3 B- x# r
cessation of treatment, the rate of bone maturation
( r7 z! j$ Z2 V* G( Y- b0 ^! Rdecelerates and gradually returns to normal.8,9
7 Z7 @' K6 w0 \: y2 BThere are conflicting reports and controversy
G1 D0 e6 `: }( ~0 x, i) @over the effect of early androgen exposure on adult5 u0 g! Z& v. K# w- U/ K
penile length.10,11 Some reports suggest subnormal
U9 g3 v) B! J. u# iadult penile length, apparently because of downreg-' v/ m' Z8 |* b5 s% b
ulation of androgen receptor number.10,12 However,
1 X& v( I( E! U& p+ j8 ESutherland et al13 did not find a correlation between
- f6 l# m# r: j6 \$ a. \, U' Ichildhood testosterone exposure and reduced adult4 S) A8 [; d ]/ H! B
penile length in clinical studies.* _7 ~+ {4 S. q% ~) ^
Nonetheless, we do not believe our patient is3 O2 m6 ?+ s/ h4 l& K1 m% q, |$ t
going to experience any of the untoward effects from1 \' t: B3 Q! Z
testosterone exposure as mentioned earlier because: `) W _# D2 ^6 D) w u
the exposure was not for a prolonged period of time.
& V* A# D/ m* jAlthough the bone age was advanced at the time of
. S" E0 D9 Y1 m S3 S- @diagnosis, the child had a normal growth velocity at5 ~* v& E5 Q& F9 F
the follow-up visit. It is hoped that his final adult: ]. J2 J& P& `
height will not be affected.
1 o( s. y7 ?3 G- b$ cAlthough rarely reported, the widespread avail- }8 p0 W' F* R! J" J: q
ability of androgen products in our society may
" {2 l- S9 f0 A7 w9 zindeed cause more virilization in male or female
$ y5 S/ l0 `0 i1 e- R+ ^children than one would realize. Exposure to andro-
3 r2 V6 K3 I& l3 W) u5 a: ygen products must be considered and specific ques-
# U! o6 i- d6 X. o4 L5 ^tioning about the use of a testosterone product or6 n0 s6 Q( n8 f2 M5 f+ k
gel should be asked of the family members during
) }( Y- N2 L( A& S% Sthe evaluation of any children who present with vir-
: {! y. ^( d i; L- bilization or peripheral precocious puberty. The diag-
* P2 |. [; d, s2 n" Snosis can be established by just a few tests and by
1 r7 }, C! g- T& E( j2 ^/ }9 Yappropriate history. The inability to obtain such a/ {* w5 h1 @* Z; l
history, or failure to ask the specific questions, may# W! ?6 K D1 G, _' v1 u
result in extensive, unnecessary, and expensive6 p# s4 M1 g- t3 A7 ]: y4 \5 }; z
investigation. The primary care physician should be
/ {! F. }( i% r2 j6 eaware of this fact, because most of these children
3 z' T- e6 ?' U4 @! x- |+ Tmay initially present in their practice. The Physicians’
% E3 O. i( D4 DDesk Reference and package insert should also put a' ^: b* `' B* s6 d+ Y* t6 k( q
warning about the virilizing effect on a male or
( {! o0 X8 U7 h! rfemale child who might come in contact with some-2 l' @* ?" i* d/ `$ u/ L6 Q
one using any of these products.: L9 ?# p; n, ^; M" X& ^
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